CN113564444B - CrMnFeNi2Cu2Ti0.1 high-entropy alloy, preparation method and heat treatment method - Google Patents
CrMnFeNi2Cu2Ti0.1 high-entropy alloy, preparation method and heat treatment method Download PDFInfo
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Abstract
A CrMnFeNi2Cu2Ti0.1 high-entropy alloy and a preparation method and a heat treatment method thereof relate to a high-entropy alloy and a preparation method and a heat treatment method thereof. The invention aims to solve the problem that the compressive strength and hardness of the high-entropy alloy are improved but the plasticity of the high-entropy alloy is often greatly reduced by changing the alloy structure through component adjustment in the conventional method. The molar ratio of Cr, Mn, Fe, Ni, Cu and Ti in the high-entropy alloy is 1:1:1:2:2: 0.1. The method comprises the following steps: firstly, weighing raw materials; secondly, vacuumizing; thirdly, arc melting. The heat treatment method comprises the following steps: firstly, polishing; secondly, carrying out heat treatment on the high-entropy alloy at the temperature of 600-1000 ℃. The CrMnFeNi2Cu2Ti0.1 high-entropy alloy after heat treatment is improved by 33 percent in compressive yield strength compared with an as-cast state under the condition of keeping the fracture compressibility of more than 20 percent and reaches 1398.2 MPa.
Description
Technical Field
The invention relates to a high-entropy alloy, a preparation method and a heat treatment method.
Background
In recent hundred years, modern society has developed rapidly, and pure metals cannot meet the performance requirements of modern industrial production and life. Alloys with better combinations of properties have more applications. The alloy is prepared by taking one or two elements as a matrix, adding other elements, and finally smelting, sintering and the like, and is a product with metal properties, so that the required performance of the product can be obtained by improving the structure of the alloy so as to meet the requirements of production and life. However, with the rapid development of science and technology and the more intensive research in various fields under extreme environments, we have made higher requirements on the performance of metal materials, especially the application in the high-heat environment of aircraft engines, the low-temperature application of pipeline transportation, and the application of metal materials under various strong-corrosion and strong-oxidation environments, and at present, the development of more than 30 traditional alloy systems has entered the plateau phase, so that a new material is urgently needed to meet the use under extreme service conditions. The Taiwan scholars of Taiwan and the leaf of the Laurencia aegypti and the like put forward the concept of the high-entropy alloy in 2004, and the multi-component high-entropy alloy has more excellent performance than the traditional alloy. Due to the unique high entropy effect, the lattice distortion effect, the delayed diffusion effect and the 'cocktail' effect of the high entropy alloy, the high entropy alloy has a unique super structure, so that the high entropy alloy has a series of excellent performances such as high strength, high hardness, high wear resistance, corrosion resistance, excellent high temperature stability and the like. The high-entropy alloy has excellent mechanical properties, and makes great contribution to accelerating the engineering application of the high-entropy alloy in a plurality of key fields.
At present, the compression strength and hardness of the high-entropy alloy can be improved through work hardening, but the plasticity of the high-entropy alloy can be greatly reduced, and in addition, the compression strength and hardness of the high-entropy alloy can be improved through changing the alloy structure through component adjustment in the prior art, but the plasticity of the high-entropy alloy is often greatly reduced.
How to keep good plasticity of the high-entropy alloy on the premise of improving or reducing the compression strength of the high-entropy alloy to a small extent is a problem which needs to be solved at present. Therefore, it is a hot spot of current research to develop and prepare high-entropy alloy with high strength and good plasticity.
Disclosure of Invention
The invention aims to solve the problem that the compressive strength and hardness of a high-entropy alloy are improved but the plasticity of the high-entropy alloy is often greatly reduced by changing the alloy structure through component adjustment in the conventional method, and provides a CrMnFeNi2Cu2Ti0.1 high-entropy alloy, a preparation method and a heat treatment method thereof.
The molar ratio of Cr, Mn, Fe, Ni, Cu and Ti in the CrMnFeNi2Cu2Ti0.1 high-entropy alloy is 1:1:1:2:2: 0.1.
A preparation method of CrMnFeNi2Cu2Ti0.1 high-entropy alloy is completed according to the following steps:
firstly, weighing raw materials:
firstly, cleaning a Cr metal block, a Mn metal block, a Fe metal block, a Ni metal block, a Cu metal block and a Ti metal block by using absolute ethyl alcohol, and then drying by blowing to obtain the cleaned Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block;
weighing the cleaned Cr metal blocks, Mn metal blocks, Fe metal blocks, Ni metal blocks, Cu metal blocks and Ti metal blocks according to the molar ratio of 1:1:1:2:2: 0.1;
secondly, vacuumizing:
firstly, vacuumizing a vacuum arc melting furnace, and then introducing argon;
secondly, repeating the second step for 2 to 4 times, and then introducing argon until the vacuum degree is 0.1 to 0.2 MPa;
thirdly, arc melting:
and adding the weighed Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block into a vacuum arc melting furnace, and melting under the protection of argon atmosphere and stirring conditions to obtain the CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot.
A heat treatment method of CrMnFeNi2Cu2Ti0.1 high-entropy alloy is completed according to the following steps:
firstly, polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
secondly, heat treatment:
placing the test piece obtained in the step one in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and introducing inert gas into the hearth to a normal pressure state;
and thirdly, circulating the step two for 2 to 4 times, introducing inert gas into the hearth, heating the vacuum induction heating furnace to 600 to 1000 ℃, preserving heat at the temperature of 600 to 1000 ℃ under the protection of the inert gas, turning off a power supply, and cooling the furnace to room temperature to obtain the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy.
The principle of the invention is as follows:
the invention prepares the CrMnFeNi2Cu2Ti0.1 high-entropy alloy, generates Cu-based solid solution (FCC) with better plasticity in a matrix by adding Cu element with multiple proportions, simultaneously adds a small amount of Ti element to improve the alloy strength, and effectively eliminates dendritic crystal structure in the as-cast high-entropy alloy to a certain extent by annealing at different temperatures, improves the mechanical property of the alloy, and ensures that the alloy has better plasticity while obtaining high strength.
The invention has the advantages that:
the CrMnFeNi2Cu2Ti0.1 high-entropy alloy prepared by the invention has basically complete structure, the alloy structure phase mainly comprises fcc phase and bcc phase solid solution, and the CrMnFeNi2Cu2Ti0.1 high-entropy alloy before heat treatment mainly comprises 3 structure forms, mainly comprises dendritic crystal structures, and has higher integral strength and better plasticity. After heat treatment, the dendrite is broken, and finally the cluster-like tissue form is presented, and a large amount of granular and short rod-shaped tissues are dispersed and precipitated in the tissue and uniformly distributed, so that the strength is obviously improved;
secondly, the compressive yield strength of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy after heat treatment can reach 1398.2MPa, the compression ratio after fracture of 21.1 percent is kept, the hardness can reach 543HV, and the alloy has good plasticity, high strength and good comprehensive performance and is in a leading position in the same type of alloy;
thirdly, the CrMnFeNi2Cu2Ti0.1 high-entropy alloy after heat treatment has good plasticity under the condition of keeping higher hardness strength.
The invention can obtain a CrMnFeNi2Cu2Ti0.1 high-entropy alloy and a heat treatment method for the CrMnFeNi2Cu2Ti0.1 high-entropy alloy.
Drawings
FIG. 1 is an XRD spectrum of a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first example;
FIG. 2 is a SEM backscattered electron image of a high-entropy alloy, wherein (a) and (b) are CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingots prepared in the first embodiment, (c) and (d) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the second embodiment through heat treatment at 600 ℃, (e) and (f) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the third embodiment through heat treatment at 800 ℃, (g) and (h) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the fourth embodiment through heat treatment at 1000 ℃;
FIG. 3 is a compressive engineering stress-strain curve of a high-entropy alloy, wherein a curve 1 is a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first embodiment, a curve 2 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the second embodiment through a heat treatment at 600 ℃, a curve 3 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the third embodiment through a heat treatment at 800 ℃, and a curve 4 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the fourth embodiment through a heat treatment at 1000 ℃;
FIG. 4 shows the hardness of the high-entropy alloy, wherein a curve 1 is a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first embodiment, a curve 2 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 600 ℃ in the second embodiment, a curve 3 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 800 ℃ in the third embodiment, and a curve 4 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 1000 ℃ in the fourth embodiment.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit of the invention.
The first embodiment is as follows: the embodiment is a CrMnFeNi2Cu2Ti0.1 high-entropy alloy, and the molar ratio of Cr, Mn, Fe, Ni, Cu and Ti in the high-entropy alloy is 1:1:1:2:2: 0.1.
The second embodiment is as follows: the preparation method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy in the embodiment is completed according to the following steps:
firstly, weighing raw materials:
firstly, cleaning a Cr metal block, a Mn metal block, a Fe metal block, a Ni metal block, a Cu metal block and a Ti metal block by using absolute ethyl alcohol, and then drying by blowing to obtain the cleaned Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block;
weighing the cleaned Cr metal blocks, Mn metal blocks, Fe metal blocks, Ni metal blocks, Cu metal blocks and Ti metal blocks according to the molar ratio of 1:1:1:2:2: 0.1;
secondly, vacuumizing:
firstly, vacuumizing a vacuum arc melting furnace, and then introducing argon;
secondly, repeating the second step for 2 to 4 times, and then introducing argon until the vacuum degree is 0.1 to 0.2 MPa;
thirdly, arc melting:
and adding the weighed Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block into a vacuum arc melting furnace, and melting under the protection of argon atmosphere and stirring conditions to obtain the CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot.
The third concrete implementation mode: the present embodiment is different from the second embodiment in that: and in the second step, firstly, vacuumizing the vacuum arc melting furnace, and introducing argon until the vacuum degree is 0.05MPa when the vacuum degree is reduced to below 1 Pa. The other steps are the same as those in the second embodiment.
The fourth concrete implementation mode: the present embodiment differs from the second to third embodiments in that: the smelting current in the third step is 180-220A, the time of each smelting is 30-50 s, and the smelting times are 3-5. The other steps are the same as those in the second to third embodiments.
The fifth concrete implementation mode: the heat treatment method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy is completed according to the following steps:
firstly, polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
secondly, heat treatment:
placing the test piece obtained in the step one in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and introducing inert gas into the hearth to a normal pressure state;
and thirdly, circulating the step two for 2 to 4 times, introducing inert gas into the hearth, heating the vacuum induction heating furnace to 600 to 1000 ℃, preserving heat at the temperature of 600 to 1000 ℃ under the protection of the inert gas, turning off a power supply, and cooling the furnace to room temperature to obtain the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy.
The sixth specific implementation mode: the fifth embodiment is different from the fifth embodiment in that: the size of the test piece in the first step is 4.5mm multiplied by 9mm or 4.5mm multiplied by 3.5 mm. The other steps are the same as those in the fifth embodiment.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: and the inert gas in the second step is argon. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the heat preservation time in the second step is 2-24 h. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the temperature rise rate in the second step is 10 ℃/min. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: and step two, circulating the step two for 2 to 4 times, introducing inert gas into the hearth, heating the vacuum induction heating furnace to 800 to 1000 ℃, preserving heat at the temperature of 800 to 1000 ℃ under the protection of the inert gas, turning off a power supply, and cooling to room temperature along with the furnace to obtain the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy. The other steps are the same as those in the first to ninth embodiments.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The first embodiment is as follows: a preparation method of CrMnFeNi2Cu2Ti0.1 high-entropy alloy is completed according to the following steps:
firstly, weighing raw materials:
firstly, cleaning a Cr metal block, a Mn metal block, a Fe metal block, a Ni metal block, a Cu metal block and a Ti metal block by using absolute ethyl alcohol, and then drying by blowing to obtain the cleaned Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block;
weighing the cleaned Cr metal blocks, Mn metal blocks, Fe metal blocks, Ni metal blocks, Cu metal blocks and Ti metal blocks according to the molar ratio of 1:1:1:2:2: 0.1;
secondly, vacuumizing:
firstly, vacuumizing a vacuum arc melting furnace, and introducing argon gas until the vacuum degree is 0.05MPa when the vacuum degree is reduced to below 1 Pa;
secondly, repeating the second step for 3 times, and then introducing argon until the vacuum degree is 0.2 MPa;
thirdly, arc melting:
adding the weighed Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block into a vacuum arc melting furnace, and melting under the protection of argon atmosphere and stirring conditions to obtain a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot;
the smelting current in the third step is 200A, the time of each smelting is 40s, and the smelting times are 3 times.
Example two: the heat treatment method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy prepared in the first embodiment is completed by the following steps:
firstly, polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
the size of the test piece in the first step is 4.5mm multiplied by 9 mm;
secondly, heat treatment:
placing the test piece obtained in the step one in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and then introducing argon into the hearth to a normal pressure state;
and thirdly, circulating the step II for 3 times, introducing argon into the hearth, heating the vacuum induction heating furnace to 600 ℃ at the heating rate of 10 ℃/min, preserving the heat for 4 hours at the temperature of 600 ℃ under the protection of argon atmosphere, turning off a power supply, cooling the furnace to room temperature, and obtaining the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at the temperature of 600 ℃.
Example three: the heat treatment method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy prepared in the first embodiment is completed by the following steps:
firstly, polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
the size of the test piece in the first step is 4.5mm multiplied by 9 mm;
secondly, heat treatment:
placing the test piece obtained in the step one in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and then introducing argon into the hearth to a normal pressure state;
and thirdly, circulating the step II for 3 times, introducing argon into the hearth, heating the vacuum induction heating furnace to 800 ℃ at the heating rate of 10 ℃/min, preserving the heat for 4 hours at the temperature of 800 ℃ under the protection of argon atmosphere, turning off a power supply, cooling the furnace to room temperature, and obtaining the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at the temperature of 800 ℃.
Example four: the heat treatment method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy prepared in the first embodiment is completed by the following steps:
firstly, polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
the size of the test piece in the first step is 4.5mm multiplied by 9 mm;
secondly, heat treatment:
placing the test piece obtained in the step one in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and then introducing argon into the hearth to a normal pressure state;
and thirdly, circulating the step II for 3 times, introducing argon into the hearth, heating the vacuum induction heating furnace to 1000 ℃ at the heating rate of 10 ℃/min, preserving the heat for 4 hours at the temperature of 1000 ℃ under the protection of argon atmosphere, turning off a power supply, cooling the furnace to room temperature, and obtaining the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at the temperature of 1000 ℃.
FIG. 1 is an XRD spectrum of a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first example;
from the XRD pattern analysis of fig. 1, it can be seen that the alloy structure is mainly a CuNi-based solid solution of FCC phase and a FeCr-based solid solution of bcc phase.
FIG. 2 is a SEM backscattered electron image of a high-entropy alloy, wherein (a) and (b) are CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingots prepared in the first embodiment, (c) and (d) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the second embodiment through heat treatment at 600 ℃, (e) and (f) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the third embodiment through heat treatment at 800 ℃, (g) and (h) are heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloys obtained in the fourth embodiment through heat treatment at 1000 ℃;
as can be seen from fig. 2, the alloy structure is substantially complete, and as can be seen from fig. 1, the alloy structure phase mainly includes fcc phase and bcc phase solid solution, and the as-cast alloy mainly includes 3 structure forms, mainly including dendrite structure, and the alloy has high overall strength and good plasticity. After heat treatment, the dendrite is broken, and finally the cluster-like tissue form is presented, and a large amount of granular and short rod-shaped tissues are dispersed and precipitated in the tissue and uniformly distributed, so that the strength is obviously improved.
FIG. 3 is a compressive engineering stress-strain curve of a high-entropy alloy, wherein a curve 1 is a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first embodiment, a curve 2 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the second embodiment through a heat treatment at 600 ℃, a curve 3 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the third embodiment through a heat treatment at 800 ℃, and a curve 4 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained in the fourth embodiment through a heat treatment at 1000 ℃;
as can be seen from FIG. 3, the CrMnFeNi2Cu2Ti0.1 high-entropy alloy after heat treatment has high strength and good plasticity, the compressive yield strength can reach 1398.2MPa, the compression ratio after fracture is 21.1%, and meanwhile, the alloy obtains the maximum hardness of 543HV, as shown in FIG. 4;
FIG. 4 shows the hardness of the high-entropy alloy, wherein a curve 1 is a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot prepared in the first embodiment, a curve 2 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 600 ℃ in the second embodiment, a curve 3 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 800 ℃ in the third embodiment, and a curve 4 is a heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment at 1000 ℃ in the fourth embodiment.
The mechanical properties of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy prepared in the first embodiment and the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by heat treatment in the second to fourth embodiments are listed in Table 1;
TABLE 1
| Examples | Compressive yield strength (MPa) | Compression after Break (%) |
| Example one | 1051.6 | 37.3 |
| Example two | 1166.8 | 35.8 |
| EXAMPLE III | 1261 | 15.5 |
| Example four | 1398.2 | 21.1 |
As can be seen from Table 1, the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy obtained by the invention has good plasticity under the condition of keeping higher hardness and strength.
Claims (8)
1. A preparation method of CrMnFeNi2Cu2Ti0.1 high-entropy alloy is characterized in that the molar ratio of Cr, Mn, Fe, Ni, Cu and Ti in the high-entropy alloy is 1:1:1:2:2:0.1, and the preparation method comprises the following steps:
firstly, weighing raw materials:
firstly, cleaning a Cr metal block, a Mn metal block, a Fe metal block, a Ni metal block, a Cu metal block and a Ti metal block by using absolute ethyl alcohol, and then drying by blowing to obtain the cleaned Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block;
weighing the cleaned Cr metal blocks, Mn metal blocks, Fe metal blocks, Ni metal blocks, Cu metal blocks and Ti metal blocks according to the molar ratio of 1:1:1:2:2: 0.1;
secondly, vacuumizing:
firstly, vacuumizing a vacuum arc melting furnace, and then introducing argon;
secondly, repeating the second step for 2-4 times, and introducing argon until the vacuum degree is 0.1-0.2 MPa;
thirdly, arc melting:
adding the weighed Cr metal block, Mn metal block, Fe metal block, Ni metal block, Cu metal block and Ti metal block into a vacuum arc melting furnace, and melting under the protection of argon atmosphere and stirring conditions to obtain a CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot;
the heat treatment method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy ingot is completed according to the following steps:
step (1), polishing:
polishing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy cast ingot by using abrasive paper, removing an oxide layer on the surface of the cast ingot, cutting the polished cast ingot by using an electric spark numerical control linear cutting machine, and finally polishing and flattening a cutting surface by using the abrasive paper to obtain a test piece;
step (2), heat treatment:
placing the test piece obtained in the step (1) in a vacuum induction heating furnace;
secondly, vacuumizing a hearth of the vacuum induction heating furnace, and introducing inert gas into the hearth to a normal pressure state;
thirdly, circulating the step (2) for 2-4 times, introducing inert gas into the hearth, heating the vacuum induction heating furnace to 600-1000 ℃, preserving heat at 600-1000 ℃ under the protection of the inert gas, turning off a power supply, and cooling to room temperature along with the furnace to obtain the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy.
2. The method for preparing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy according to claim 1, is characterized in that in the second step, a vacuum arc melting furnace is firstly vacuumized, and argon is introduced until the vacuum degree is 0.05MPa when the vacuum degree is reduced to be less than 1 Pa.
3. The preparation method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy as claimed in claim 1 or 2, wherein the current for smelting in the third step is 180-220A, the time for smelting is 30-50 s each time, and the number of smelting times is 3-5.
4. A method for producing a crmnfeni2cu2ti0.1 high entropy alloy according to claim 1, wherein the dimensions of the test piece in step (1) are 4.5mm x 9mm or 4.5mm x 3.5 mm.
5. A method for preparing a crmnfeni2cu2ti0.1 high entropy alloy according to claim 1, wherein the inert gas in step (2) is argon.
6. The preparation method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy as claimed in claim 1, wherein the heat preservation time in the third step (2) is 2-24 h.
7. The method for preparing the CrMnFeNi2Cu2Ti0.1 high-entropy alloy according to claim 1, wherein the temperature rise rate in the third step (2) is 10 ℃/min.
8. The preparation method of the CrMnFeNi2Cu2Ti0.1 high-entropy alloy according to claim 1, which is characterized in that the step (2) is circulated for 2-4 times in the step (2), inert gas is introduced into a hearth, a vacuum induction heating furnace is heated to 800-1000 ℃, heat preservation is carried out at 800-1000 ℃ under the protection of the inert gas, a power supply is turned off, the furnace is cooled to room temperature, and the heat-treated CrMnFeNi2Cu2Ti0.1 high-entropy alloy is obtained.
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| CN103194656A (en) * | 2013-04-19 | 2013-07-10 | 梧州漓佳铜棒有限公司 | AlxCrFeNiCuVTi high-entropy alloy material and preparation method thereof |
| CN108642399A (en) * | 2018-05-17 | 2018-10-12 | 哈尔滨工业大学 | One kind having base high-entropy alloy and preparation method thereof |
| US20190017150A1 (en) * | 2017-07-13 | 2019-01-17 | The Industry & Academic Cooperation In Chungnam National University (Iac) | Cr Filament-Reinforced CrMnFeNiCu(Ag)-Based High-Entropy Alloy and Method for Manufacturing the Same |
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| CN103194656A (en) * | 2013-04-19 | 2013-07-10 | 梧州漓佳铜棒有限公司 | AlxCrFeNiCuVTi high-entropy alloy material and preparation method thereof |
| US20190017150A1 (en) * | 2017-07-13 | 2019-01-17 | The Industry & Academic Cooperation In Chungnam National University (Iac) | Cr Filament-Reinforced CrMnFeNiCu(Ag)-Based High-Entropy Alloy and Method for Manufacturing the Same |
| CN108642399A (en) * | 2018-05-17 | 2018-10-12 | 哈尔滨工业大学 | One kind having base high-entropy alloy and preparation method thereof |
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